EXSC 314 Chapter 5 The Shoulder Joint PPT

EXSC 314 Chapter 5 The Shoulder Joint PPT Series 5 B

Muscles of the Glenohumeral Joint The glenohumeral joint has both intrinsic and extrinsic muscles. Intrinsic glenohumeral muscles originate on the scapula and clavicle and insert on the humerus: deltoid, coracobrachialis, teres major, and the rotator cuff group (SITS) Extrinsic glenohumeral muscles originate on the trunk and insert on the humerus: latissimus dorsi and the pectoralis major

Muscle Location Anterior � Pectoralis major � Coracobrachialis � Subscapularis Superior � Deltoid � Supraspinatus Posterior � Latissimus dorsi � Teres major � Infraspinatus � Teres minor

Muscles of the Glenohumeral Joint: Deltoid Muscle

Muscles of the Glenohumeral Joint: Deltoid Muscle - Video

Muscles of the Glenohumeral Joint: Pectoralis Major Muscle

Muscles of the Glenohumeral Joint: Pectoralis Major Muscle

Muscles of the Glenohumeral Joint: Pectoralis Major Muscle - Video

Muscles of the Glenohumeral Joint: Latissimus Dorsi Muscle

Muscles of the Glenohumeral Joint: Latissimus Dorsi Muscle - Video

Muscles of the Glenohumeral Joint: Teres Major Muscle

Muscles of the Glenohumeral Joint: Teres Major Muscle - Video

Muscles of the Glenohumeral Joint: Coracobrachialis Muscle

Muscles of the Glenohumeral Joint: Coracobrachialis Muscle - Video Start Video @ 2: 15 (short discussion)

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles (SITS) Subscapularis Attach to lesser tubercle anterior (internal rotation) Infraspinatus Attach to greater tubercle posteriorly (external rotation) Teres minor Attach to greater tubercle posteriorly (external rotation) Supraspinatus Attach to greater tubercle from above (abduct) Anterolateral View

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles (SITS) Relatively small muscles that must possess adequate strength and muscular endurance. Conducting repetitious overhead activities (throwing, swimming, and pitching) with poor technique, muscle fatigue, or inadequate warm-up and conditioning leads to: � Failure of the rotator cuff muscle group in dynamically stabilizing the humeral head in the glenoid cavity � Rotator cuff problems such as tendinitis and rotator cuff impingement

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles : Subscapularis

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles : Infraspinatus Muscle

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles : Teres Minor Muscle

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles : Supraspinatus Muscle

Muscles of the Glenohumeral Joint: Rotator Cuff Muscles - Video FYI only – Video has additional information on innervation

Muscles of The Glenohumeral Joint: Principle Movements Glenohumeral Flexion � Anterior deltoid � Upper pectoralis major Glenohumeral Adduction � Latissimus dorsi � Teres major � Lower pectoralis major Glenohumeral Extension � Teres major � Latissimus dorsi � Lower pectoralis major Glenohumeral Abduction � Deltoid � Supraspinatus � Upper pectoralis major

Muscles of The Glenohumeral Joint: Principle Movements Glenohumeral Internal Rotation � Latissimus dorsi � Teres major � Subscapularis � Pectoralis major Glenohumeral Horizontal Adduction � Anterior deltoid � Pectoralis major � Coracobrachialis Glenohumeral External Rotation � Infraspinatus � Teres minor Glenohumeral Horizontal Abduction � Posterior deltoid � Middle deltoid � Infraspinatus � Teres minor

Muscles of The Glenohumeral Joint: Principle Movements Glenohumeral Diagonal Abduction Adduction � Anterior deltoid � Coracobrachialis � Biceps brachii (short head) � Pectoralis major (upper and lower fibers) � Posterior deltoid � Infraspinatus � Teres minor � Triceps brachii (long head) End of PPT Series 5 B